Chusetts



T. A. CLARK 2e H. e. MASGROPTQ FRUIT JAR COVER... 7

N0.-107,003. Patented Sept. 6, 1870.

ZM/zne55 es THOMAS a. CLARK AND HENRY MASGROFT, or WoRoiJsTER, MASSA- cnosnrrs,

.lmttc'rs Ilatwit N l07,003, dated September 6, 1870.

FRUIT-JAR COVER.

- h Schedule referred to in these Letters Patent and making part of the name.

To all whom it may concern: 7

Be it; known thatwe,1'no)1r\s A. CLARK and HENRY 0. MASCRO'FT,-both of the city and county of Worcester and State of Massachusetts, have in- To enable those skilled in the art to which our invention belongs to make and use the same, we will proceed to describe itn'iorc in detail.

The nature of our invention consists in the combination, with the cover of a fruit-jar, of an air-valve, spring, and'cylindcr for inclosing and supporting the same, arranged substantially as hereinafter described.

in the drawing' The part marlte'd A indicates the jar:

B- the cover; and

O, the rubber packingfring.

The cover B is, in this instance, made to screw on to the top of the jar A, but it may be secured to the jar in any other well-known manner if preferred.

In the top of the cover B is formed a small hole, a, and above said hole is arranged a'inetalliccylinder, D,

in the top of which is formed a similar hole, I).

A valve, 1), of rubber or other suitable material, is arranged in the lower part; of the cylinder D, which covers the hole (a in the cover B, upon which it; is pressed firmly down by a coil-wire spring, F, which latter is arranged within thecylinder 1) above the valve E, as fully shown in the drawing. i

Instead of a coiled -wire spring, F, a spring of any other material, or even a weight, may'he uscd for holding down the valve E.

its operation'is as follows:

The jar being filled with fruit, the cover is placed on and screwed down upon the packing-ring O, or

otherwise fastened to the top of the jar. The jar is shown and described.

then heated, and the expansion of its contents forces the air out through the hole a, the valve E readily rising-to permit its passage.

wWhen the air has thus all been forced out, the Jar is'allowcd to cool. .-lhe valve E is drawn closely down over the hole a as the contents of the jar contract, so that no airman re-enter the jar, and a vac'uinn isthns formed whichis much more perfect than can be obtained with the jar-cover in ordinary use.. Com

sequently, the fruitis preserved in a much better con-- dition, while, at'the same time, the operation of canning is simplified and rendered less laboriousand objectionable, as will be fully understood and appreciated by those skilled in the artto which our invention belongs.

The devices herein shown and described present an exceedingly convenient and cheap arrangement; for accomplishing the results above named. They occupy but little space upon the cover, and it; is not ncces sary to fasten the valve or .spring to the cover, as

they are both contained within the cylinder 1), which lit-s around the valve so as to steady it; and insure its position above the opening in the cover, while it, in like. manner. supportsand holds in..p'lace the spring or weight by which thevalve is pressed down, so that, by simply fastening the cylinder to the cover, both the valve and spring are at once held in position above the opening which they are the means of closing.

\Veare aware that; heretofore. a valve has been held by spring pressure over an opening in the cover, and this we do not, claim; but

Having described our improvements in fruit-jar cover,

What we claim therein as new and of our invention, and desire to secure by Letters Patent, is.--

A fruit-jar cover provided with the valve E, spring F, and cylinder D, arranged for operation as herein THOMAS A, CLARK.

HENRY O. MASCRUFT.

Witnesses:

'lnos. H. Donor, A. E. PEIRGE. 

